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DPMO Calculator

Calculate DPMO, sigma level, DPU, and PPM from defects, units, and defect opportunities for Six Sigma quality analysis.

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What Is DPMO?

DPMO (Defects Per Million Opportunities) measures process quality in manufacturing and services. Lower DPMO means fewer defects relative to the number of chances for a defect to occur.

DPMO Formula

$$\text{DPMO} = \frac{1{,}000{,}000 \times \text{defects}}{\text{units} \times \text{defect opportunities per unit}}$$

Related metrics:

  • DPU (defects per unit) = defects / units
  • PPM (defects per million units) = (1,000,000 × defects) / units

Six Sigma targets fewer than 3.4 DPMO at the 6σ level with a 1.5σ shift. For yield analysis, see the Amdahl's Law Calculator.

Frequently Asked Questions

What is the difference between DPMO and PPM?

DPMO counts defects per million opportunities, so one unit can contribute multiple opportunities. PPM counts total defects per million units and ignores how many defect types each unit has.

What is a good DPMO value?

Lower is better. Six Sigma quality is below 3.4 DPMO. Many production lines operate between 3σ (about 66,807 DPMO) and 5σ (about 233 DPMO).

What is a defect opportunity?

A defect opportunity is one specific way a unit can fail inspection. A pair of jeans might have five opportunities: missing button, faulty seam, wrong size, dingy material, and broken zipper.

What is the 1.5 sigma shift?

Industry practice adds a 1.5σ buffer to account for long-term process drift. Sigma levels in Six Sigma tables include this shift when converting DPMO to sigma level.

How do I calculate DPMO from a sample?

Count total defects found, count units inspected, and multiply defect types per unit for opportunities. Plug those three numbers into the DPMO formula.

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